Calculating device.



G. H. MLLER.

GALGULATNG DEX/10E.

APPLICATION FILED JAN. 27, 1909. RENEWED OUT. 1G, 1909.

Patented Dec. 7, 1909,

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/1 f I 1/ By @y f' ATU/mr W ESSES nnirnn.

CHARLES MILLER, F i

CALCUL "f iilClii.

Specification of Letter Application filed January 27, 1909, Serial No.151,420.2. Renewed Gc'tober 1S, SGS. Serial No. 523,055.

necessary to calculate the accrued intnesrl on bonds and the lil-:o 'forcertain periode o? 1 time and thin work nrniahee a notable L in onths.

'hating deacer ucd i invention i rra i lines oi" months are respec`tively lated to the months of the. index colinnw '16a and areconsecutively precedent to such latter menthe. For example, the topnien-th o the index column in Fig. is

, t daraarv and the tivo months of the to i 1 I Lc v row in" whichcorrespond to the January nv intli oit the index colunin are December 7,October 7, September and whit'ch months it will be observed tive monthspreceding the month et 'The inonth of: the index i C February and themonths i the :row .1Gb related to the second month of i: colui' i arethe tive months imme- C; February.

eren?, table 'l5 is provided with 31 anionnie of interest calculated ata.

10 -arc prepared on a :sheet of paper,

ample of the urses to which nihY niay be adwintageouslv put, atthougjhthe 2O use of the invention in in no wise limited tt that particularwork.

My invention involves various other tures ot importance and all ot theniwill be fully set. i'orth hereinafter and particu- 1 larlv pointed outin the claiine. i

Reference is now had to the accen'ipany ing drawings which illustrate,are an exain- 1 ple, the preferred inanner ot practieallj,Y enibodying`my invention.

Figure 1 is a face vie7 of the device; Fig. 2 is a` view of the monthScale or e, and Fig, 3 is an enlarged section on lines 3-3 of Fig. l.

'The body of. the device coinrn'iecs a Suitable casing 10 the front orupper of which is formed with two paraliei and 14, through the t'oi'incret which tal e e on a given principal over the pc- I5 corresponding tothe months Thiene 3i roi/ve of inten nt Si days and at the end. gareswhich. desivnate to which the row relater. so oi the case it), betweenthe are indicated certain rates' ch are the saine for each ot caicolumns or" months on the here shown, the rates ofin- 35 Loin 3% to 6%including 33% Gbv'iously.Ax however, the rates of may changedi as may bethe rinie time without departing rom fein npute. interest. accruing insix months on thousand dollar bonds-the usual ration of municipal andindustrial 95 i ies, Assuming now that on the Second day of Januaryinterest had been accruing; since September on a thousand dollar bondand the amount of that interest was to l l l l i 'l5 is visible andthrough the latter of ivhiei .in exposed the month table 1G. ieee tableslinen i other fabric, and are wound over rollers it" i and i8respectively. Said rollers a proi vided at one end ot the casino; l0with spring l t the invention the instrument will be kept mainder of thesurface of the month table adpisted so mat the current month m the isoccupied by a number of linee i6" of 'friction devices if) which preventidie niobe calculat 7 the nionth table Should be 100 tion. The rollers`are also provided with i turned to e pose the month @t January andknurled wheels1 2O which facilitate manually' t the interest tableturned 'to expose the row rotating the rollers' in one direction or thel of figures on t ie interest table indexed other to expose through theSlots i2 and lit A fh the operi tor 'then has only 'to refer anv desiredportions oi? the tables l5 and it. to part. the interest table under the105 'The mont-hi. table 1G has at its lett hand l September" todetermine the rate cud an index column 1(3"1 on which writ creat,ivhereupini the figure on thginteu. accort'ting` to the embodiment ofthe in. i i table under Such interest rate will give vention Shown inthe drawing@ the tweive the troni September to the consecutive inontheIof the year. The Q d day-oF January. ln the practical use o l indexcolumn 1Gn of the month table will be exposed and each day the interesttable should be adjusted to expose the day of the month through the slotl5. The accountant has then only to turn to the device Whereupon a mereglance will indicate the interest accrued to date from any periodcovered by months of the months table. Obviously, the scope of thedevice may be videly extended beyond that illustrated in the drawings.The example given in the drawings has been made, in the interest ofclear-ness, as simple as possible. But in practice the capacity ot' thecalculating device may be multiplied to any desired extent as well asmay be moditied the mechanical device for n'lountii'ig and exposing orindicating particular parts of the month and interest tables.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent ot' the United States, is:

l. A calculating device having a table ivith the index column of monthsand rows of months respectively related to the months .of the indexcolumn, such rows being conv secutively precedent to the months of theindex column to which 'they relate, an interest table calculated toamounts of interest on a given principal at a given rate for periodscorresponding to the'months of the trst named table, and arranged to beread in conncction'with the months thereof and means for indicatingcertain parts of such tables, whereby the accrued interest on saidprincipal from any of the precedent months of the first named table tothe date may be exhibited at Will.

2. A calculating device having with openings in the face thereof, pairsof rollers mounted in the casing and adapted to lbe manually operated, amonth table mounted on one of such pairs of rollers and visible in partthrough one of the openings in the face of the casing, such table havingthe index column of months and rows of months respectively related ,tothe months of the index column, such rows being consecutively precedentto thev months of the index column to which they relate, and an interesttable Wound over the second pair of rollers and visible in art throughthe second opening in the casing, the interest table having amounts ofinterest on a given rate for periods corresponding to the months of thefirst named table and arranged to be read in connection therewith,whereby the accrued interest on said principal 'from any of theprecedent months of the first named table to date may be exhibited atwill.

In testimony whereofv I have signed my name to this specification in thepresence ot' two subscribing Witnesses.

CHARLES H. MILLER.

a casing lVitnesses ISAAC B. (DWENS, B. Breen.

